Jesse, There has been quite a few posts about this very topic. Just from using the search function of the forums I found a few different threads. Here is one that might help you in your quest for tower speakers.

To summarize, there are quite a few options out there. the "best" tower speaker is really your own opinion. NVS, Wetsounds, HSE, and Skylon all make HLCD (Horn Loaded Compression Driver) systems which are the loudest and clearest sounding setups that you will hear at the rider. Their websites are